classes/patch: optionally return non-patch sources

classes/patch: optionally return non-patch sources

commit:

  patch.bbclass: abstract out logic that determines patches to apply

gives the ability for other clases to emit series files for use outside
of a build system, or even within the build system. There are sometimes
elements on the SRC_URI that while not directly applicable to patching,
can be related to patching the package. For example, the yocto kernel
class would like to know about these other source items on the SRC_URI
to locate out of tree kernel features.

This change keeps the default behaviour of returning patches, but adds the
ability to request that non-patch results be returned.  Additional filtering
within the non-patch category, is left up to the caller of the routine.

(From OE-Core rev: 41e92923a0b2fe047ecaa9f9ffb564d6069f784f)

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>